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公开(公告)号：US12119968B2
公开(公告)日：2024-10-15
申请号：US18364308
申请日：2023-08-02
Applicant: STMicroelectronics Asia Pacific Pte Ltd.
Inventor： Ade Putra , Kusuma Adi Ningrat , Mythreyi Nagarajan
CPC classification number: H04L27/22 , G06F3/04162 , G06F3/04166 , H03M1/124
Abstract: A device includes an analog to digital converter configured to convert voltages into a digital signal by sampling the voltages at a fixed sampling time; a first multiplier configured to multiply the digital signal with in-phase coefficients, the in-phase coefficients generated to produce a demodulated in-phase signal at a demodulation signal frequency; a first adder configured accumulate the demodulated in-phase signal to output in-phase magnitude values; a second multiplier configured to multiply the digital signal with quadrature coefficients, the quadrature coefficients generated to produce a demodulated quadrature signal at the demodulation signal frequency; and a second adder configured to accumulate the demodulated quadrature signal to output quadrature magnitude values.
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公开(公告)号：US10852879B2
公开(公告)日：2020-12-01
申请号：US16223428
申请日：2018-12-18
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Praveesh Chandran , Manivannan Ponnarasu , Mythreyi Nagarajan
IPC: G06F3/041 , G06F3/0354 , G06F3/044
Abstract: A touch screen controller identifies an island in a matrix of acquired touch data values. A first sharpness of the island is calculated and a second sharpness of the island is calculated if the calculated first sharpness is greater than a sharpness threshold. A dynamic strength threshold is then determined as a function of the second sharpness if a variance of the island is greater than a dynamic variance threshold. A determination is then made that the identified island is a valid stylus island if a peak strength of the island is greater than the dynamic strength threshold.
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公开(公告)号：US20170177136A1
公开(公告)日：2017-06-22
申请号：US14974299
申请日：2015-12-18
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Praveesh Chandran , Manivannan Ponnarasu , Mythreyi Nagarajan
IPC: G06F3/041 , G06F3/0354 , G06F3/044
CPC classification number: G06F3/0416 , G06F3/03545 , G06F3/044 , G06F2203/04106
Abstract: An electronic device disclosed herein includes a touch screen controller to identify an island i.e., a matrix of acquired touch data values, the island including adjacent touch data values indicating a potential touch of a touch sensitive screen. A first sharpness of the island is calculated using a first normalization type and not a second normalization type. A second sharpness of the island is calculated using the first and second normalization types if the first sharpness is greater than the sharpness threshold. A dynamic variance threshold is determined as a function of the second sharpness. A dynamic strength threshold is determined as a function of the second sharpness if a variance of the island is greater than the dynamic variance threshold, and the island is determined to be a valid stylus island if the peak strength is greater than the dynamic strength threshold.
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公开(公告)号：US11765006B2
公开(公告)日：2023-09-19
申请号：US17245890
申请日：2021-04-30
Applicant: STMicroelectronics Asia Pacific Pte Ltd.
Inventor： Ade Putra , Kusuma Adi Ningrat , Mythreyi Nagarajan
CPC classification number: H04L27/22 , G06F3/04162 , G06F3/04166 , H03M1/124
Abstract: A device includes an analog to digital converter configured to convert voltages into a digital signal by sampling the voltages at a fixed sampling time; a first multiplier configured to multiply the digital signal with in-phase coefficients, the in-phase coefficients generated to produce a demodulated in-phase signal at a demodulation signal frequency; a first adder configured accumulate the demodulated in-phase signal to output in-phase magnitude values; a second multiplier configured to multiply the digital signal with quadrature coefficients, the quadrature coefficients generated to produce a demodulated quadrature signal at the demodulation signal frequency; and a second adder configured to accumulate the demodulated quadrature signal to output quadrature magnitude values.
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公开(公告)号：US20180011596A1
公开(公告)日：2018-01-11
申请号：US15207105
申请日：2016-07-11
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Lokesh Kumar Korapati , Manivannan Ponnarasu , Mythreyi Nagarajan
CPC classification number: G06F3/0418 , G06F3/044 , G06F2203/04104
Abstract: A method of foreign matter rejection for multi-touch capacitive touch screens includes performing touch detection in both self-capacitance mode and mutual capacitance mode. By combining information from both modes, a distinction is identified between wanted touches, such as by a finger or stylus, and unwanted touches such as by foreign matter.
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Patent Agency Ranking
公开(公告)号：US09246485B2
公开(公告)日：2016-01-26
申请号：US13739112
申请日：2013-01-11
Applicant: STMicroelectronics Asia Pacific Pte. Ltd.
Inventor： Chee Yu Ng , Mythreyi Nagarajan
CPC classification number: H03K17/9622 , G06F3/044 , H03K2017/9602
Abstract: A single ITO layer design for a touchscreen panel incorporates a matrix of sensor cells formed from a single ITO layer of capacitive sensor pads, sensor bars, force lines and sense lines. Columns of multiplexed force lines are connected to rows of sensor pads to form force trees such that the force line of the end pair of sensor pads has a wide track, with the force lines of each subsequent pair of sensor pads having a reduced track width. Disposed between the columns of force trees, the matrix of sensor cells also includes columns of sensor bars connected to control circuitry via sense lines. The control circuitry applies a signal to the force trees to generate capacitance between rows of sensor pads and adjacent sensor bars. The control circuitry senses changes in the capacitance and resolves the location of a user touch in the matrix of sensor cells.
Abstract translation: 用于触摸屏面板的单个ITO层设计包括由电容式传感器焊盘，传感器棒，强制线和感测线的单个ITO层形成的传感器单元矩阵。 复合力线的列连接到传感器垫的行以形成力树，使得传感器焊盘的端对对的力线具有宽的轨迹，每个后续传感器对的力线具有减小的轨道宽度。 设置在力树柱之间，传感器单元的矩阵还包括通过感测线连接到控制电路的传感杆的列。 控制电路向力树施加信号以在传感器垫和相邻传感器条之间的行之间产生电容。 控制电路感测电容的变化，并且解决用户触摸传感器单元矩阵中的位置。
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公开(公告)号：US20230379200A1
公开(公告)日：2023-11-23
申请号：US18364308
申请日：2023-08-02
Applicant: STMicroelectronics Asia Pacific Pte Ltd.
Inventor： Ade Putra , Kusuma Adi Ningrat , Mythreyi Nagarajan
CPC classification number: H04L27/22 , G06F3/04166 , G06F3/04162 , H03M1/124
Abstract: A device includes an analog to digital converter configured to convert voltages into a digital signal by sampling the voltages at a fixed sampling time; a first multiplier configured to multiply the digital signal with in-phase coefficients, the in-phase coefficients generated to produce a demodulated in-phase signal at a demodulation signal frequency; a first adder configured accumulate the demodulated in-phase signal to output in-phase magnitude values; a second multiplier configured to multiply the digital signal with quadrature coefficients, the quadrature coefficients generated to produce a demodulated quadrature signal at the demodulation signal frequency; and a second adder configured to accumulate the demodulated quadrature signal to output quadrature magnitude values.
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公开(公告)号：US10599276B2
公开(公告)日：2020-03-24
申请号：US16162925
申请日：2018-10-17
Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD
Inventor： Praveesh Chandran , Lokesh Kumar Korapati , Mythreyi Nagarajan
Abstract: The present disclosure is directed to a system and method to remove common mode noise projected onto a touch sensor array from a display. The system is configured to activate two rows of electrodes at the same time, while coupling remaining rows of electrodes to ground. A first one of the two activated rows is used for detection of a touch and a second one of the two activated rows is used to detect common mode noise from the display. The common mode noise detected by the second row is removed from signals received from a plurality of columns of the touch sensor array.
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公开(公告)号：US10303299B2
公开(公告)日：2019-05-28
申请号：US15397340
申请日：2017-01-03
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Manivannan Ponnarasu , Mythreyi Nagarajan
IPC: G06F3/041
Abstract: Disclosed herein is a touch screen controller operable with a touch screen. The touch screen controller includes input circuitry configured to receive touch data from the touch screen, and processing circuitry. The processing circuitry is configured to identify an island in the touch data, determine whether a horizontal groove is present in the island, determine whether a vertical groove is present in the island, and determine whether a diagonal groove is present in the island. The processing circuitry determines the island to indicate a single elongated touch where a diagonal groove is present in the island but horizontal and vertical grooves are not present in the island.
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公开(公告)号：US10120509B2
公开(公告)日：2018-11-06
申请号：US14982349
申请日：2015-12-29
Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD
Inventor： Praveesh Chandran , Lokesh Kumar Korapati , Mythreyi Nagarajan
Abstract: The present disclosure is directed to a system and method to remove common mode noise projected onto a touch sensor array from a display. The system is configured to activate two rows of electrodes at the same time, while coupling remaining rows of electrodes to ground. A first one of the two activated rows is used for detection of a touch and a second one of the two activated rows is used to detect common mode noise from the display. The common mode noise detected by the second row is removed from signals received from a plurality of columns of the touch sensor array.
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